type
  TForm1 = class(TForm)
  ListView1: TListView;
  procedure FormCreate(Sender: TObject);
  procedure FormDestroy(Sender: TObject);
  private
  FListViewWndProc: TWndMethod;
  procedure ListViewWndProc(var Msg: TMessage);
  public
  { Private declarations }
  FShowHoriz: Boolean;
  FShowVert: Boolean;
  end;
  var
  Form1: TForm1;
 implementation
 {$R *.dfm}
 procedure TForm1.ListViewWndProc(var Msg: TMessage);
 begin
  ShowScrollBar(ListView1.Handle, SB_HORZ, FShowHoriz);
  ShowScrollBar(ListView1.Handle, SB_VERT, FShowVert);
  FListViewWndProc(Msg); // process message
end;
 procedure TForm1.FormCreate(Sender: TObject);
 begin
  FShowHoriz := True; // show the horiz scrollbar
 FShowVert := False; // hide vert scrollbar
 FListViewWndProc := ListView1.WindowProc; // save old window proc
 ListView1.WindowProc := ListViewWndProc; // subclass
end;
 procedure TForm1.FormDestroy(Sender: TObject);
 begin
  ListView1.WindowProc := FListViewWndProc; // restore window proc
 FListViewWndProc := nil;
 end;